(A) yes
(B) ** no
(C) ** No No No No and NO
(D) yay
EXPLANATIONS BELOW
Concept note-1: -Obama left office on January 20, 2017, and continues to reside in Washington, D.C. His presidential library in Chicago began construction in 2021. Since leaving office, Obama has remained active in Democratic politics, including campaigning for candidates in various American elections.
Concept note-2: -Barack Obama’s tenure as the 44th president of the United States began with his first inauguration on January 20, 2009, and ended on January 20, 2017.
Concept note-3: -Abraham Lincoln has taken the highest ranking in each survey and George Washington, Franklin D. Roosevelt, and Theodore Roosevelt have always ranked in the top five while James Buchanan, Andrew Johnson, and Franklin Pierce have been ranked at the bottom of all four surveys.
Concept note-4: -Barack Obama served as the 44th President of the United States.
Concept note-5: -The 46th and current president of the United States is Joseph R. Biden, Jr. He was sworn in on January 20, 2021.